add index template completion, index pattern filter and name filter

cmd/completion.go

@@ -34,6 +34,7 @@ const (
 	Cilm
 	Cnode
 	Cclustersettings
+	Cindextemplate
 )
 
 func complete(conf *cfg.Config, cmd *cli.Command, what int) {
@@ -65,6 +66,8 @@ func complete(conf *cfg.Config, cmd *cli.Command, what int) {
 		list, err = es.NodeNames(conf)
 	case Cclustersettings:
 		list, err = es.ClusterSettingsNames(conf)
+	case Cindextemplate:
+		list, err = es.IndexTemplateNames(conf)
 	}
 
 	if err != nil {